Measurement of small angular displacement by a modified moire technique

Brahm Pal Singh; Kowsalya Varadan; Vijay Trimbak Chitnis

doi:10.1117/12.60025

1 December 1992 Measurement of small angular displacement by a modified moiré technique

Brahm Pal Singh, Kowsalya Varadan, Vijay Trimbak Chitnis

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Optical Engineering, Vol. 31, Issue 12, (December 1992). https://doi.org/10.1117/12.60025

Abstract

Small angle measurement using a modified moiré interference technique is reported. The range of angle measurement for 25-μm pitch gratings is about ± 25 μrad and the accuracy of measurement is of the order of 0.2 μrad with a time constant of 0.1 s. A piezoelectric transducer (PZT) is used for angular displacement. The angular sensitivity under the present experimental conditions is found to be of the order of 21.8 mV/μrad.

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Brahm Pal Singh, Kowsalya Varadan, and Vijay Trimbak Chitnis "Measurement of small angular displacement by a modified moiré technique," Optical Engineering 31(12), (1 December 1992). https://doi.org/10.1117/12.60025

Published: 1 December 1992

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